Shelf for a display unit



FIG. 1 shows a perspective view of my design for a shelf for a display unit;

FIG. 2 shows a front elevational view thereof;

FIG. 3 shows a rear elevational view thereof;

FIG. 4 shows right side elevational view thereof;

FIG. 5 shows a left side elevational view therof;

FIG. 6 shows a top view thereof; and,

FIG. 7 shows a bottom view thereof.

The broken lines depict a portion of the shelf for a display unit that forms no part of the claimed design. 

CLAIM The ornamental design for a shelf for a display unit, as shown and described. 